package com.zijie.demo5;

class Base{
  public Base(String s){
    System.out.print("B");
  }
}

public class Derived extends Base{
  public Derived (String s) {
    super(s);
    System.out.print("D");
  }
  public static void main(String[] args){
    new Derived("C");
  }
}
//BD